Messages in this thread Patch in this message | | | From | Brijesh Singh <> | Subject | [Part1 PATCH v4 04/17] x86/realmode: Don't decrypt trampoline area under SEV | Date | Sat, 16 Sep 2017 07:34:05 -0500 |
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From: Tom Lendacky <thomas.lendacky@amd.com>
When SEV is active the trampoline area will need to be in encrypted memory so only mark the area decrypted if SME is active.
Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Borislav Petkov <bp@suse.de> Cc: Andy Lutomirski <luto@kernel.org> Cc: Laura Abbott <labbott@redhat.com> Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> Cc: linux-kernel@vger.kernel.org Cc: x86@kernel.org Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com> Signed-off-by: Brijesh Singh <brijesh.singh@amd.com> --- arch/x86/realmode/init.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/arch/x86/realmode/init.c b/arch/x86/realmode/init.c index 1f71980fc5e0..d03125c2b73b 100644 --- a/arch/x86/realmode/init.c +++ b/arch/x86/realmode/init.c @@ -63,9 +63,10 @@ static void __init setup_real_mode(void) /* * If SME is active, the trampoline area will need to be in * decrypted memory in order to bring up other processors - * successfully. + * successfully. This is not needed for SEV. */ - set_memory_decrypted((unsigned long)base, size >> PAGE_SHIFT); + if (sme_active()) + set_memory_decrypted((unsigned long)base, size >> PAGE_SHIFT); memcpy(base, real_mode_blob, size); -- 2.9.5
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